1 /*-
2 * Copyright (c) 2009-2010 The FreeBSD Foundation
3 * All rights reserved.
4 *
5 * This software was developed by Pawel Jakub Dawidek under sponsorship from
6 * the FreeBSD Foundation.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #ifndef _SYNCH_H_
31 #define _SYNCH_H_
32
33 #include <errno.h>
34 #include <pthread.h>
35 #ifdef HAVE_PTHREAD_NP_H
36 #include <pthread_np.h>
37 #endif
38 #include <stdbool.h>
39 #include <time.h>
40
41 #include "pjdlog.h"
42
43 #ifndef PJDLOG_ASSERT
44 #include <assert.h>
45 #define PJDLOG_ASSERT(...) assert(__VA_ARGS__)
46 #endif
47
48 static __inline void
mtx_init(pthread_mutex_t * lock)49 mtx_init(pthread_mutex_t *lock)
50 {
51 int error;
52
53 error = pthread_mutex_init(lock, NULL);
54 PJDLOG_ASSERT(error == 0);
55 }
56 static __inline void
mtx_destroy(pthread_mutex_t * lock)57 mtx_destroy(pthread_mutex_t *lock)
58 {
59 int error;
60
61 error = pthread_mutex_destroy(lock);
62 PJDLOG_ASSERT(error == 0);
63 }
64 static __inline void
mtx_lock(pthread_mutex_t * lock)65 mtx_lock(pthread_mutex_t *lock)
66 {
67 int error;
68
69 error = pthread_mutex_lock(lock);
70 PJDLOG_ASSERT(error == 0);
71 }
72 static __inline bool
mtx_trylock(pthread_mutex_t * lock)73 mtx_trylock(pthread_mutex_t *lock)
74 {
75 int error;
76
77 error = pthread_mutex_trylock(lock);
78 PJDLOG_ASSERT(error == 0 || error == EBUSY);
79 return (error == 0);
80 }
81 static __inline void
mtx_unlock(pthread_mutex_t * lock)82 mtx_unlock(pthread_mutex_t *lock)
83 {
84 int error;
85
86 error = pthread_mutex_unlock(lock);
87 PJDLOG_ASSERT(error == 0);
88 }
89 static __inline bool
mtx_owned(pthread_mutex_t * lock)90 mtx_owned(pthread_mutex_t *lock)
91 {
92
93 return (pthread_mutex_isowned_np(lock) != 0);
94 }
95
96 static __inline void
rw_init(pthread_rwlock_t * lock)97 rw_init(pthread_rwlock_t *lock)
98 {
99 int error;
100
101 error = pthread_rwlock_init(lock, NULL);
102 PJDLOG_ASSERT(error == 0);
103 }
104 static __inline void
rw_destroy(pthread_rwlock_t * lock)105 rw_destroy(pthread_rwlock_t *lock)
106 {
107 int error;
108
109 error = pthread_rwlock_destroy(lock);
110 PJDLOG_ASSERT(error == 0);
111 }
112 static __inline void
rw_rlock(pthread_rwlock_t * lock)113 rw_rlock(pthread_rwlock_t *lock)
114 {
115 int error;
116
117 error = pthread_rwlock_rdlock(lock);
118 PJDLOG_ASSERT(error == 0);
119 }
120 static __inline void
rw_wlock(pthread_rwlock_t * lock)121 rw_wlock(pthread_rwlock_t *lock)
122 {
123 int error;
124
125 error = pthread_rwlock_wrlock(lock);
126 PJDLOG_ASSERT(error == 0);
127 }
128 static __inline void
rw_unlock(pthread_rwlock_t * lock)129 rw_unlock(pthread_rwlock_t *lock)
130 {
131 int error;
132
133 error = pthread_rwlock_unlock(lock);
134 PJDLOG_ASSERT(error == 0);
135 }
136
137 static __inline void
cv_init(pthread_cond_t * cv)138 cv_init(pthread_cond_t *cv)
139 {
140 pthread_condattr_t attr;
141 int error;
142
143 error = pthread_condattr_init(&attr);
144 PJDLOG_ASSERT(error == 0);
145 #ifdef HAVE_PTHREAD_CONDATTR_SETCLOCK
146 error = pthread_condattr_setclock(&attr, CLOCK_MONOTONIC);
147 PJDLOG_ASSERT(error == 0);
148 #endif
149 error = pthread_cond_init(cv, &attr);
150 PJDLOG_ASSERT(error == 0);
151 error = pthread_condattr_destroy(&attr);
152 PJDLOG_ASSERT(error == 0);
153 }
154 static __inline void
cv_wait(pthread_cond_t * cv,pthread_mutex_t * lock)155 cv_wait(pthread_cond_t *cv, pthread_mutex_t *lock)
156 {
157 int error;
158
159 error = pthread_cond_wait(cv, lock);
160 PJDLOG_ASSERT(error == 0);
161 }
162 static __inline bool
cv_timedwait(pthread_cond_t * cv,pthread_mutex_t * lock,int timeout)163 cv_timedwait(pthread_cond_t *cv, pthread_mutex_t *lock, int timeout)
164 {
165 struct timespec ts;
166 int error;
167
168 if (timeout == 0) {
169 cv_wait(cv, lock);
170 return (false);
171 }
172
173 #ifdef HAVE_PTHREAD_CONDATTR_SETCLOCK
174 error = clock_gettime(CLOCK_MONOTONIC, &ts);
175 PJDLOG_ASSERT(error == 0);
176 ts.tv_sec += timeout;
177 error = pthread_cond_timedwait(cv, lock, &ts);
178 #elif HAVE_PTHREAD_COND_TIMEDWAIT_RELATIVE_NP
179 ts.tv_sec = timeout;
180 ts.tv_nsec = 0;
181 error = pthread_cond_timedwait_relative_np(cv, lock, &ts);
182 #else
183 #error Neither pthread_condattr_setclock nor pthread_cond_timedwait_relative_np is available.
184 #endif
185 PJDLOG_ASSERT(error == 0 || error == ETIMEDOUT);
186 return (error == ETIMEDOUT);
187 }
188 static __inline void
cv_signal(pthread_cond_t * cv)189 cv_signal(pthread_cond_t *cv)
190 {
191 int error;
192
193 error = pthread_cond_signal(cv);
194 PJDLOG_ASSERT(error == 0);
195 }
196 static __inline void
cv_broadcast(pthread_cond_t * cv)197 cv_broadcast(pthread_cond_t *cv)
198 {
199 int error;
200
201 error = pthread_cond_broadcast(cv);
202 PJDLOG_ASSERT(error == 0);
203 }
204 #endif /* !_SYNCH_H_ */
205